COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES McDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters AD/HU 369/34 Amdt 1 Tail Rotor Hub - Inspection and Modification 4/79 Applicability: All 500 model 369H Series with tail rotor hub assemblies and tail rotor blade attachment bolts as listed in Hughes SIN No. HN-128.1. Document: Hughes SIN No. HN-128.1. Compliance: As per requirement document.